Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 971 · 40 questions

Robot tip (Find the topic, use the formula): Find the topic: moving, motors, gears, wheels, sensors, echo, line or gyro. Use the rule: teeth × turns; circumference × turns; 17 cm per ms of echo; below the threshold = black; right adds degrees. Check: put your answer back into the rule.

1. 1.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a gyro sensor (b) a camera (c) a touch sensor (d) a sound sensor
2. 2.🦾 A servo program runs:
   angle = 60
   angle = angle − 60
   angle = angle + 10
   angle = angle + 50
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
3. 3.Which of these suits wheels? (a) flying over a field (b) a hospital corridor (c) crossing stepping-stones (d) deep mud
4. 4.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
5. 5.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs backward. What does the robot do? (a) goes straight forward (b) spins right on the spot (c) goes straight back (d) turns right
6. 6.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
7. 7.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
8. 8.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
9. 9.Which job needs a camera? (a) measure how far a box is (b) start on a hand clap (c) know a button is pressed (d) read a QR code
10. 10.📡 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
11. 11.🧭 A robot should turn right 45°, but its gyro shows it turned 41°. How many degrees must it turn more to the right?
12. 12.🔍 Why do robots need sensors? (a) to use more power (b) to know their world (c) to look colourful (d) to be heavier
13. 13.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 9 times. How far does the robot roll (in cm)?
14. 14.🧭 How many degrees is a full turn? (a) 100° (b) 360° (c) 180° (d) 90°
15. 15.🧭 A robot spins 90° every second. How many seconds does it take to turn 90°?
16. 16.⚙️ A big gear drives a small gear. The small gear turns … (a) faster but weaker (b) at the same speed (c) slower but stronger (d) not at all
17. 17.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
18. 18.🛞 Which way of moving suits this best: “a long factory floor”? (a) wheels (b) legs (c) tracks (d) propellers
19. 19.📡 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
20. 20.🧭 A robot faces south. It does: turn left, turn right, turn around, turn right. Which way does it face now? (a) west (b) south (c) east (d) north
21. 21.⚙️ A 10-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
22. 22.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
23. 23.⚙️ A motor makes 60 turns a minute with an 8-tooth gear on it. That gear drives a 16-tooth gear. How many turns a minute does the 16-tooth gear make?
24. 24.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
25. 25.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 80. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) both sensors (d) the right sensor
26. 26.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) True (b) False
27. 27.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) small (fast, weak) (c) big (slow and strong) (d) zero
28. 28.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a soft foam cushion (c) a wooden box (d) a metal door
29. 29.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
30. 30.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 4 turn? (a) clockwise (b) anticlockwise
31. 31.📡 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
32. 32.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
33. 33.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 180°. It turns right 45°, then left 90°. What does the gyro read now (0° to 359°)?
34. 34.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
35. 35.⚙️ A 10-tooth gear drives a 50-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
36. 36.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) propellers (b) tracks (c) wheels (d) legs
37. 37.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 39. What is under the sensor? (a) the white floor (b) the black line
38. 38.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
39. 39.🦾 A servo moves from 90° to 0°. How many degrees does it turn?
40. 40.🛞 Which way of moving suits this best: “loose sand dunes”? (a) legs (b) wheels (c) tracks (d) propellers

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